/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hdfs.protocol.FSConstants.DatanodeReportType;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.DFSClient;
import org.apache.hadoop.fs.Path;
import junit.framework.TestCase;
/**
* This class tests that a file need not be closed before its
* data can be read by another client.
*/
public class TestDatanodeRegistration extends TestCase {
/**
* Regression test for HDFS-894 ensures that, when datanodes
* are restarted, the new IPC port is registered with the
* namenode.
*/
public void testChangeIpcPort() throws Exception {
HdfsConfiguration conf = new HdfsConfiguration();
MiniDFSCluster cluster = null;
FileSystem fs = null;
try {
cluster = new MiniDFSCluster(conf, 1, true, null);
fs = cluster.getFileSystem();
InetSocketAddress addr = new InetSocketAddress(
"localhost",
cluster.getNameNodePort());
DFSClient client = new DFSClient(addr, conf);
// Restart datanodes
cluster.restartDataNodes();
// Wait until we get a heartbeat from the new datanode
DatanodeInfo[] report = client.datanodeReport(DatanodeReportType.ALL);
long firstUpdateAfterRestart = report[0].getLastUpdate();
boolean gotHeartbeat = false;
for (int i = 0; i < 10 && !gotHeartbeat; i++) {
try {
Thread.sleep(i*1000);
} catch (InterruptedException ie) {}
report = client.datanodeReport(DatanodeReportType.ALL);
gotHeartbeat = (report[0].getLastUpdate() > firstUpdateAfterRestart);
}
if (!gotHeartbeat) {
fail("Never got a heartbeat from restarted datanode.");
}
int realIpcPort = cluster.getDataNodes().get(0)
.dnRegistration.getIpcPort();
// Now make sure the reported IPC port is the correct one.
assertEquals(realIpcPort, report[0].getIpcPort());
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
}